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Call process signal CALL PROCEEDING refers to the calling's message sent to the called, indicating that the call is being processed. ( )

In H.323 protocol, opening the logical channel follows the rule of "who want to transmit, who open it". ()

Which of the following description is correct about the relationship between RTCP port number and RTP port number? ( )

The NLog is part of SMC, Huawei’s conference management software. ()

The methods for scheduling a conference that supports recording include ( ). (Select 3 answers)

The network diagnostic tool supports remote diagnostic mode, and the network diagnostic tool remotely controls another network diagnostic tool to initiate a network diagnosis and judgment against other network diagnostic tools.

Call setup signaling SETUP refers to the calling's message sent to the called, expressed the hope to establish a call. ( )

Illuminance, expressed by the luminous flux received per unit area, expressed in lux (Lux, lx).

Packet loss retransmission ARQ, similar to TCP's retransmission mechanism, requires the peer to resend the UDP when the UDP packet loss of the video stream is detected in the network Stream, the receiving side stores the received stream in a certain cache, and only opens the decoding after receiving the retransmitted stream.

Users can dial the MCU IP address and follow the IVR instructions to create a conference. ()

What is the role of HD terminal LAN2 port ? ( )

Call Setup Signaling SETUP refers to a message sent by the caller to the called, indicating that the call is wanted to be established.

In Multi - channel Cascading, the prioritie at using the multiple channels is ( ).

The SR message in TCP is a sending report, which describes the sending and receiving statistics of the sending gateway.

For INVITE transaction, messages are retransmitted at intervals of () by default.

Under the static NAT network, which is wrong about the signaling description of the public network terminal calling the private network terminal?

HD video terminal upgrade software format is ( ).

In H.460 protocol, Which stipulates the H.323 media stream part of the public and private network traversing process? ( )

Multicast allows one or multiple senders (multicast sources) to send one data packet to multiple receivers at a time. ( )

Image format refers to the size or resolution of the image. Commonly used image formats include SOCIF, QCIF, CIF, ACIF, 16CIF, HD and Full HD.

The network port of the switch connected to the MCU must be: LOOM half-duplex.

According to the H.323 protocol, the signaling required to complete the process of capability exchange is?

The basic functions of the firewall include: content filtering, user authentication, VPN, application proxy, NAT, packet filtering & state detection, IDs and alarms, logs, etc.

The recording request from a video terminals sent to the MCU and the MCU controls the record ing.()

Loudness indicates the strength of the sound, and which can determine the loudness?

MCU built-in WEB includes multi-user management, address book management, conference management and equipment management.

Under IVR application scenario, by which way the terminal can not join a meeting?

SEC: Super Error Concealment, is a kind of anti packet loss technology using ARQ algorithm. ( )

In the video system, Anti Packet Loss mainly has forward error correction FEC and packet loss retransmission ARQ. ( )

The To tag, From tag, and Call-ID define the SIP relationship between the user agent client (UAC) and user agent server (UAS), which refers to a dialog. ()